Abstract
Three novel zinc coordination polymers (NH 4) n [Zn(Hida)Cl 2] n ( 1) , [Zn(ida)(H 2O) 2] n ( 2), [Zn(Hida) 2] n ·4 nH 2O ( 3) (H 2ida=iminodiacetic acid) and a monomeric complex [Zn(ida)(phen)(H 2O)]·2H 2O ( 4) (phen=1,10-phenanthroline) have been synthesized and characterized by X-ray diffraction methods. 1 and 2 form one-dimensional (1-D) chain structures, whereas 3 exhibits a three-dimensional (3-D) diamondoid framework with an open channel. The mononuclear complex 4 is extended into a 3-D supramolecular architecture through hydrogen bonds and π– π stacking. Interestingly, cyclic nonplanar tetrameric water clusters are observed that encapsulated in the 3-D lattice of 4. Based on 1H and 13C NMR observations, there is obvious coordination of complex 2 in solution, while 1 and 3 decompose into free iminodiacetate ligand. Monomer [Zn(ida)(H 2O) 3] ( 5) is considered as a possible discrete species from 2. These coordination polymers can serve as good molecular precursors for zinc oxide.
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